EGR Cooler Bypass Position Sensor Circuit Intermittent/Erratic Bank 2

Where it lives

For P249B, start at the sensor the description names. The description of P249B puts it on bank 2.

Check these first

• A loose bank 2 bypass position sensor connector
• An erratic bank 2 bypass position sensor
• Debris in the bank 2 bypass position sensor connector
• An ECM that reads the position signal intermittently

What to do next

1. Read the bank 2 bypass position sensor while wiggling the harness
2. Inspect the position sensor connector for debris or loose pins
3. Command the bypass flap and watch for a steady position signal
4. Check the bank 2 harness for chafe
5. Replace the bypass position sensor if the signal stays erratic
6. Clear the code and retest

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